Tube microphonics

Maybe. I’ve only rarely heard any tubes acting microphonics in power amps, and only for very old NOS tubes in the V1 / input slots. Amps are very far downstream in the gain structure, so microphonics are rarely an issue. Tube preamps and phono stages are a different story.

Anyways, I’ve had a few different tube power amps right besides my speakers. Never in front, but I’ve had them on bare floor, spikes, hockey pucks, isolation feet and even expensive $3K isolation shelves. Never heard that much difference from the isolation, sorry. I play loud too. Swapping the AMPS themselves, however, is always a hugely audible difference.

Update on tube dampers for KT150s. Herbie’s does make tube dampers for KT150s. They are $54 ea. So I will need a total of 16 x 2. Power output. And 2 x 2 drivers. For a total of 36 KT150s. -$1944 

IMO tube dampers on power tubes will have no effect unless you’re doing it for the look. Never had a power tube be microphonic in the slightest. I’ve also never had any damper solve a microphonic tube issue in a preamp -- the solution in that case is a new tube, or a different preamp with lower gain.

perhaps i wasn’t clear in my earlier post and created some confusion -- arc puts dampers only on low level tubes -- not the power tubes

My experience echoes Mulveling's

Never had a power tube be microphonic in the slightest.